Created
July 5, 2010 15:16
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/*! | |
* jQuery JavaScript Library v1.4.2 | |
* http://jquery.com/ | |
* | |
* Copyright 2010, John Resig | |
* Dual licensed under the MIT or GPL Version 2 licenses. | |
* http://jquery.org/license | |
* | |
* Date: Sat Feb 13 22:33:48 2010 -0500 | |
*/ | |
jQuery.extend = jQuery.fn.extend = function() { | |
// copy reference to target object | |
var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options, name, src, copy; | |
// Handle a deep copy situation | |
if ( typeof target === "boolean" ) { | |
deep = target; | |
target = arguments[1] || {}; | |
// skip the boolean and the target | |
i = 2; | |
} | |
// Handle case when target is a string or something (possible in deep copy) | |
if ( typeof target !== "object" && !jQuery.isFunction(target) ) { | |
target = {}; | |
} | |
// extend jQuery itself if only one argument is passed | |
if ( length === i ) { | |
target = this; | |
--i; | |
} | |
for ( ; i < length; i++ ) { | |
// Only deal with non-null/undefined values | |
if ( (options = arguments[ i ]) != null ) { | |
// Extend the base object | |
for ( name in options ) { | |
src = target[ name ]; | |
copy = options[ name ]; | |
// Prevent never-ending loop | |
if ( target === copy ) { | |
continue; | |
} | |
// Recurse if we're merging object literal values or arrays | |
if ( deep && copy && ( jQuery.isPlainObject(copy) || jQuery.isArray(copy) ) ) { | |
var clone = src && ( jQuery.isPlainObject(src) || jQuery.isArray(src) ) ? src | |
: jQuery.isArray(copy) ? [] : {}; | |
// Never move original objects, clone them | |
target[ name ] = jQuery.extend( deep, clone, copy ); | |
// Don't bring in undefined values | |
} else if ( copy !== undefined ) { | |
target[ name ] = copy; | |
} | |
} | |
} | |
} | |
// Return the modified object | |
return target; | |
}; | |
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